Oct 24th, Aircal heat pump factory got good news from TUV (Guangzhou) laboratory, The latest monoblock R32 DC inverter heat pump passed the Noise level test. The Noise test was made on below products: 6KW,9KW,12KW and 18KW.
In order to control the heat pump noise, Aircal engineers tried a lot of new methods to reduce heat pump vibration(including change the water pump, improving the air duct design, improving the sound insulation and increase the noise abs0rbing material).
Aircal R32 DC inverter heat pump was full DC inverter product, and with Monoblock design, so it can adjust the running frequency automatically by its inside program. In the high frequency running condition, Product will get higher running sound. In order to control the noise level, Some special methods is very necessary.
Finally we controlled the noise to be a quite low level before the products were sent to TUV noise test laboratory.
What is the Noise of DC inverter heat pump ?
The Noise of heat pump unit is the irregular, intermittent, continuous or random noise generated by the heat pump unit during operation. The difference between heat pump noise and industrial noise or traffic noise (high-frequency noise) is the frequency. Heat pump running noise is in low frequency (sound with a frequency below 500 Hz). Low-frequency noise is characterized by slow attenuation, long sound waves, and strong penetration (its diffracted waves can easily bypass obstacles), so low-frequency noise is not easy to handle. Long-term low-frequency noise will have a bad effect on human health, so it must be strictly controlled.
This is also the reason in European Union, Noise test must be done and Noise level must be controlled. In EU Regulation : EN 12102-1 2017, It declares that the heat pump must be tested on Noise level.
Since October, Aircal factory sent the test samples to TUV laboratory to test under EN 12102-1 2017. Finally we get a good noise figure and passed the test.